JP7255162B2 - Tire metal wire detection system and metal wire detection method - Google Patents

Description

The present invention relates to a tire metal line detection system and a metal line detection method.

BACKGROUND ART A pneumatic tire used for a vehicle includes a tread that contacts the ground, sidewalls that extend radially inward from both sides of the tread in the width direction, beads that are arranged radially inward of the sidewalls, and the like. In addition, a carcass serving as a frame of the tire is provided inside the tire, and a belt that increases the rigidity of the tread is provided on the tread-side surface of the carcass. The belt has many metal belt cords.

In the pneumatic tire as described above, if the belt cord arrangement is disturbed or if the belt itself shifts from the center in the width direction of the tire to the left or right, there is a concern that the performance of the tire will be degraded. Tires with such events are thus detected and eliminated during the manufacturing process.

Japanese Unexamined Patent Application Publication No. 2002-200003 discloses a metal wire detection device capable of checking the arrangement and disorder of belt cords. This metal wire detection device is equipped with a sensor head having a coil, and by bringing the sensor head close to both ends in the width direction of the tread of a tire, the distance from the sensor head to the steel cord is detected, and the presence or absence of abnormality is detected. determine.

JP 2007-7915 A

Pneumatic tires vary in size and shape depending on the type of vehicle (use of the tire), such as passenger cars, two-wheeled vehicles, trucks and buses. Even tires mounted on the same type of vehicle have different shapes due to differences in specifications such as width and height. The metal wire detection device described in Patent Document 1 can manually finely adjust the angle of the sensor head and finely adjust the distance to the tire according to the position of the tire. Therefore, it is difficult to adjust the position of the sensor head according to different tire shapes.

An object of the present invention is to provide a metal wire detection system and a metal wire detection method that can move a sensor head to an appropriate measurement position according to the shape of a tire.

(1) A metal wire detection system according to the present invention includes:
A metal wire detection system for detecting a metal wire embedded in a tire from the outside of the tire,
a rotating device for rotating the tire;
a detection device having a sensor head arranged at a predetermined measurement position near the surface of the tire rotated by the rotating device;
a moving device for moving the sensor head;
a control device that controls the operation of the moving device so as to move the sensor head to the measurement position according to the shape of the tire;
the mobile device
at least one of a radial movement mechanism for moving the sensor head in the radial direction of the tire and an axial movement mechanism for moving the sensor head in the axial direction of the tire;
an angle adjustment mechanism for adjusting the angle of the sensor head with respect to the surface of the tire.

In the metal wire detection system having the above configuration, the control device controls the operation of the moving device so that the sensor head is moved to the measurement position according to the shape of the tire, so the sensor head is moved to the appropriate measurement position. be able to. In addition, the radial movement mechanism can move the sensor head to an appropriate radial position according to the height dimension of the tire, and the axial movement mechanism can move the sensor head to an appropriate position according to the width dimension of the tire. The sensor head can be moved. Then, the angle of the sensor head arranged near the surface of the tire can be adjusted by the radial movement mechanism and/or the axial movement mechanism according to the surface shape of the tire by the angle adjustment mechanism.

(2) Preferably, the sensor head is attached to the angle adjustment mechanism.
According to this configuration, the angle of the sensor head can be directly adjusted by the angle adjustment mechanism, so that the angle can be adjusted more accurately according to the surface shape of the tire.

(3) Preferably, the angle adjustment mechanism is attached to either the radial movement mechanism or the axial movement mechanism.
According to this configuration, either the radial movement mechanism or the axial movement mechanism can position the sensor head and the angle adjustment mechanism at appropriate radial or axial positions with respect to the tire.

(4) Preferably, the radial movement mechanism comprises a main movement mechanism having a larger maximum movement distance of the sensor head and a sub-movement mechanism having a smaller maximum movement distance,
the axial movement mechanism is attached to the main movement mechanism;
The sub-movement mechanism is attached to the axial movement mechanism,
The angle adjusting mechanism is attached to the sub-moving mechanism.
According to this configuration, the main moving mechanism of the radial moving mechanism causes the axial moving mechanism, the sub-moving mechanism, the angle adjusting mechanism, and the sensor head to move greatly in the radial direction, thereby quickly bringing the sensor head closer to the tire. The sub-movement mechanism allows the sensor head to be moved in a small radial direction to easily position the sensor head at a more appropriate radial position with respect to the tire.

(5) Preferably, the angle adjustment mechanism includes two cylinders arranged parallel to each other, and a mounting member to which the sensor head is mounted and which is connected to piston rods of both cylinders. .
According to this configuration, the angle of the sensor head can be adjusted via the mounting member by individually extending and contracting the two cylinders. Also, when the angle of the sensor head is adjusted, the radial position or axial position of the sensor head may change accordingly, and the distance to the tire surface may also change. Thus, the radial position or axial position of the sensor head can be adjusted while maintaining the angle.

(6) Preferably, the metal wire detection system further includes an information acquisition device that acquires information about the shape of the tire,
The control device controls the operation of the mobile device based on the information input from the information acquisition device.
With such a configuration, the sensor head can be moved to an appropriate measurement position according to the shape of the tire.

(7) Preferably, the metal wire detection system further comprises a rotation detector that detects a rotation angle of the tire,
The control device performs a process of associating the detection data of the detection device with the angle data of the rotation detector.
With such a configuration, it is possible to grasp the state of the metal wire of the tire and the rotation angle of the tire together. It becomes possible to

(8) The metal wire detection method of the present invention is
A metal wire detection method for detecting a metal wire embedded in a tire from the outside of the tire,
obtaining information about the shape of the tire;
rotating the tire;
moving the sensor head of the detection device to a predetermined measurement position near the surface of the tire according to the obtained tire shape;
and detecting a metal wire with the detection device.

By such a method, the sensor head can be moved to an appropriate measurement position according to the shape of the tire.

According to the metal wire detection system of the present invention, the sensor head can be moved to an appropriate measurement position according to the shape of the tire.

1 is a cross-sectional view of part of a tire to be detected by a metal wire detection system according to an embodiment of the present invention; FIG. 1 is a schematic front view of a metal wire detection system; FIG. It is a front view which shows an angle adjustment mechanism. 2. (a) is a sectional view taken along line AA of FIG. 2, and (b) is a sectional view taken along line CC of FIG. It is a schematic front view explaining operation|movement of a moving apparatus. It is a schematic front view explaining operation|movement of a moving apparatus. 4 is a flow chart showing a processing procedure of the control device; It is a front view which shows the modification of an angle adjustment mechanism.

Embodiments of the present invention will be described below.
[Tire Configuration]
FIG. 1 is a cross-sectional view of part of a tire to be detected by a metal wire detection system according to one embodiment of the present invention.
In FIG. 1 , the lateral direction is the axial direction (width direction) X of the tire 1 , and the vertical direction is the radial direction Y of the tire 1 . The direction perpendicular to the plane of FIG. 1 is the circumferential direction of the tire 1 . In this FIG. 1 , the dashed-dotted line CL represents the equatorial plane of the tire 1 .

A tire 1 is a pneumatic tire, and is used by being mounted on a passenger car, for example. A tire 1 has a tread 2 , sidewalls 3 and beads 4 .
The tread 2 is arranged on the outer peripheral portion of the tire 1 . The outer peripheral surface of the tread 2 is a tread surface 2a that contacts the road surface. The tread 2 is made of crosslinked rubber.

The sidewalls 3 extend radially inward from both widthwise sides of the tread 2 . The sidewall 3 is made of crosslinked rubber. Various markings are made on the outer surface of the sidewall 3 . For example, the outer surface of the sidewall 3 is provided with markings indicating the tire name, size (width dimension, rim diameter, aspect ratio, etc.), manufacturer name, and the like.

The bead 4 is arranged radially inside the sidewall 3 . The bead 4 has a core 4a and an apex 4b. The core 4a includes steel wires extending in the circumferential direction. The core 4a has a rectangular cross section. The apex 4b is located radially outside the core 4a. The apex 4b is made of crosslinked rubber.

A carcass 5 , a belt 6 , a band 7 and an inner liner 8 are provided inside the tire 1 .
A carcass 5 is located inside the tread 2 , sidewalls 3 and beads 4 . Carcass 5 includes at least one carcass ply. In this tire 1, the end of the carcass ply passes from the inner side in the width direction of the core 4a to the inner side in the radial direction and is folded back in the outer side in the width direction of the core 4a.

The belt 6 is laminated on the carcass 5 on the radially inner side of the tread 2 . The belt 6 of the tire 1 shown in FIG. 1 consists of two belt plies 6a. Each belt ply 6a includes a large number of belt cords arranged side by side. Each belt cord is inclined with respect to the equatorial plane. The angle formed by this belt cord with respect to the equatorial plane is 10° or more and 35° or less. The material of the belt cord is metal such as steel.

Band 7 is located between tread 2 and belt 6 in the radial direction. The band 7 covers the entire belt 6. This band 7 has a jointless structure.
The inner liner 8 is positioned inside the carcass 5 . The inner liner 8 constitutes the inner surface of the tire 1 . This inner liner 8 is made of crosslinked rubber. The inner liner 8 retains the internal pressure of the tire 1 .

[Configuration of metal wire detection system 10]
FIG. 2 is a schematic front view of a metal wire detection system;
The metal wire detection system 10 of this embodiment detects the ends of the belt cords forming the belt 6 . The metal wire detection system 10 has a rotation device 11, a detection device 12, a movement device 13, a control device 14, an information acquisition device 15, and an output device 16, as shown in FIG. In FIG. 2, the tire 1 is arranged with the axial direction X directed vertically and the radial direction Y directed horizontally. Therefore, in the following description, the vertical direction may be referred to as the axial direction X, and the horizontal direction may be referred to as the radial direction Y.

(Configuration of rotating device 11)
The rotating device 11 supports and rotates the tire 1 . In this embodiment, a tire testing machine that performs uniformity inspection of the tire 1 is used as the rotating device 11 . The tire testing machine 11 has a tire support section 21 , a rotation detector 27 and a measurement section 23 . The tire 1 is supported by the tire support portion 21 in a horizontal posture with its axis directed vertically. The tire support portion 21 has a rim member 24 attached to the tire 1 . The tire 1 assembled to the rim member 24 is filled with air.

Furthermore, the tire support portion 21 has an upper rotating shaft 25 a connected to the upper portion of the rim member 24 and a lower rotating shaft 25 b connected to the lower portion of the rim member 24 .
The rotation detector 27 detects the rotation angle of the tire 1 supported by the tire support portion 21 . The rotation detector 27 is provided, for example, on the upper rotating shaft 25a or the lower rotating shaft 25b. A rotary encoder, for example, is used as the rotation detector 27 .

The measuring section 23 has a rotating drum 26 . The rotating drum 26 is rotatably supported around a vertical axis. The rotating drum 26 is provided movably in the horizontal direction, and contacts the outer peripheral surface of the tire 1 held by each tire support portion 21 . The measurement unit 23 also has a driving unit (not shown) that drives the rotary drum 26 to rotate. The tire 1 in contact with the rotating drum 26 rotates as the rotating drum 26 rotates.

The measuring unit 23 has a measuring device (not shown) such as a load cell for measuring the force applied from the tire 1 to the rotating drum 26 in a predetermined direction.
Note that the tire testing machine 11 is not limited to the configuration in which the rotating drum 26 of the measuring section 23 is rotationally driven, and may be configured to rotationally drive the tire 1 . In this case, for example, the upper rotating shaft 25a or the lower rotating shaft 25b of the tire support portion 21 can be rotationally driven by a drive motor or the like.

(Configuration of detection device 12)
The detection device 12 is a non-contact sensor capable of detecting metal. The detection device 12 detects the end of the belt cord of the tire 1 that is supported and rotated by the tire testing machine 11 . An eddy-current displacement sensor, for example, is used as the detection device 12 . The detection device 12 has two sensor heads 31 and a sensor unit 32 .

Two sensor heads 31 are provided vertically corresponding to both ends in the width direction of the tread 2 of the tire 1 arranged horizontally. The sensor head 31 has a coil that generates a magnetic field by high frequency current. The sensor unit 32 includes a transmission circuit for applying a high-frequency current to the coil of the sensor head 31, a detection circuit for detecting changes in impedance of the coil as changes in voltage, an output circuit for outputting changes in voltage, and the like.

When metal approaches the coil of the sensor head 31, an eddy current is generated in the metal by the magnetic field generated by the coil. Then, when the distance from the coil to the metal changes, the magnitude of the eddy current changes substantially in proportion to this change, and the impedance of the coil containing the metal changes. The detection circuit detects a change in oscillation amplitude (voltage amplitude) due to this impedance change, and the output circuit outputs this voltage amplitude change as detection data. The output of the output circuit is input to the control device 14, which will be described later.

Note that the detection device 12 is not limited to the eddy current displacement sensor described above, and other types of sensors such as a capacitance sensor can be employed.

(Configuration of moving device 13)
The moving device 13 positions the two sensor heads 31 of the detecting device 12 at predetermined measurement positions near the surface of the tire 1 . Since the detection device 12 of the present embodiment detects both ends of the belt cord of the belt 6, the sensor head 31 is placed near the surface (buttress surface B) at both ends in the width direction of the tread 2 (see FIG. 1). ). Moreover, since the buttress surface B is inclined with respect to the axial direction X and the radial direction Y, the sensor head 31 is also inclined along the buttress surface B. As shown in FIG.

The moving device 13 includes an angle adjusting mechanism 35 , a radial moving mechanism 36 and an axial moving mechanism 37 .
A pair of upper and lower angle adjusting mechanisms 35 are provided. The upper and lower angle adjustment mechanisms 35 are configured vertically symmetrical with each other. Each angle adjustment mechanism 35 includes a mounting member 41 , an actuator 42 and a support frame 43 .

The mounting member 41 is used to support the sensor head 31 and connect the sensor head 31 to the actuator 42 . The mounting member 41 includes a mounting portion 41a arranged obliquely with respect to the radial direction Y and the axial direction X, and a connecting portion 41b arranged substantially along the radial direction Y. As shown in FIG. The sensor head 31 is attached to the attachment portion 41a. The actuator 42 is connected to the connecting portion 41b.

The actuator 42 is composed of, for example, an electric cylinder. The electric cylinder 42 expands and contracts when electric power is supplied. The electric cylinder 42, as shown in FIG. 3, has a cylinder body 42a and a piston rod 42b provided movably in the length direction with respect to the cylinder body 42a.

The angle adjustment mechanism 35 of this embodiment includes two electric cylinders 42 . The two electric cylinders 42 are arranged side by side in the radial direction Y. The two electric cylinders 42 are arranged parallel to each other along the axial direction X, and extend and contract in the axial direction X together. Also, the two electric cylinders 42 expand and contract independently. A cylinder body 42 a of the electric cylinder 42 is supported by a support frame 43 . The tip of the piston rod 42b of the electric cylinder 42 is rotatably connected to the connecting portion 41b of the mounting member 41. As shown in FIG.

FIG. 3 is a front view showing an angle adjusting mechanism. In particular, FIG. 3 shows a state in which the sensor head 31 of the detection device 12 is arranged along the buttress surface B of tires 1 having different shapes.
The angle of the sensor head 31 of the detection device 12 is adjusted by extending and retracting the two electric cylinders 42 . FIG. 3(a) shows a state in which the two electric cylinders 42 are expanded and contracted by approximately the same amount. FIG. 3(b) shows a state in which one electric cylinder 42 arranged on the tire 1 side is extended more than the other electric cylinder 42. FIG. FIG. 3C shows a state in which the other electric cylinder 42 is extended more than the one electric cylinder 42 .

As shown in FIGS. 3(a) to 3(c), the angle adjustment mechanism 35 extends and retracts the two electric cylinders 42 independently to adjust the angle of the sensor head 31b according to the inclination of the buttress surface B of the tire 1. The angle can be set appropriately.
Further, by extending and contracting the two electric cylinders 42 in the same direction by the same amount, the distance in the axial direction X can be adjusted while the angle of the sensor head 31 is maintained. Therefore, even if the distance in the axial direction X from the surface of the tire 1 to the sensor head 31 changes due to the adjustment of the angle of the sensor head 31, the distance to the surface of the tire 1 is maintained while the angle of the sensor head 31 is maintained. can be adjusted.

As shown in FIG. 2, the radial movement mechanism 36 includes a sub-movement mechanism 36B and a main movement mechanism 36A. The main moving mechanism 36A is configured such that the maximum moving distance of the sensor head 31 is longer than that of the sub-moving mechanism 36B.

A pair of upper and lower sub-moving mechanisms 36B are provided. The sub-moving mechanism 36B has an actuator 45 , a guide member 46 and a support frame 47 . The actuator 45 is composed of, for example, an electric cylinder. The electric cylinder 45 expands and contracts in the radial direction Y when electric power is supplied.

The electric cylinder 45 includes a cylinder body 45a and a piston rod 45b. The cylinder body 45 a is attached to the support frame 47 . The tip of the piston rod 45b is connected to the support frame 43 of the angle adjusting mechanism 35. As shown in FIG. Therefore, the angle adjusting mechanism 35 and the sensor head 31 move in the radial direction Y when the electric cylinder 45 is extended and retracted.

The guide member 46 guides the movement of the angle adjustment mechanism 35 and the sensor head 31 in the radial direction Y due to the expansion and contraction of the electric cylinder 45 so that these movements are performed smoothly. The guide member 46 has a guide shaft 46a and a guide tube 46b. The guide shaft 46 a is arranged along the radial direction Y, and one end is connected to the support frame 47 of the angle adjustment mechanism 35 . The guide tube 46b is attached to the support frame 47. As shown in FIG. The guide shaft 46a is slidably inserted into the guide tube 46b, and guides the movement of the guide shaft 46a in the radial direction Y (the axial direction of the guide shaft 46a).

The support frame 47 of the sub-movement mechanism 36B is supported by the axial movement mechanism 37 described later, and the support frame 53 of this axial movement mechanism 37 is supported by the main movement mechanism 36A.
The main moving mechanism 36A is composed of a screw feed mechanism 49 such as a ball screw. The screw feed mechanism 49 has a screw shaft 49a arranged along the radial direction Y, a drive motor 49b that rotationally drives the screw shaft 49a, and a nut member 49c attached to the screw shaft 49a.

The nut member 49 c is connected to the support frame 53 of the axial movement mechanism 37 . The nut member 49c moves in the radial direction Y (in the axial direction of the screw shaft 49a) as the screw shaft 49a rotates. Therefore, the axial moving mechanism 37, the sub-moving mechanism 36B, the angle adjusting mechanism 35, and the sensor head 31 also move in the radial direction Y together with the nut member 49c.

4(a) is a sectional view taken along line AA in FIG. 2, and FIG. 4(b) is a sectional view taken along line CC in FIG.
As shown in FIGS. 2 and 4 , the axial movement mechanism 37 has a screw feed mechanism 51 such as a ball screw, a guide member 52 and a support frame 53 .
The screw feed mechanism 51 includes a screw shaft 51a attached to the upper portion of the support frame 53, a screw shaft 51b that spans the upper and lower portions of the support frame 53, and a drive motor that rotationally drives the screw shafts 51a and 51b. 51c. Each screw shaft 51a, 51b is arranged along the axial direction X. As shown in FIG. As shown in FIG. 4A, a nut member 51d connected to the support frame 47 of the upper sub-moving mechanism 36B is attached to the screw shaft 51a. As shown in FIG. 4(b), a nut member 51d connected to the support frame 47 of the lower sub-moving mechanism 36B is attached to the screw shaft 51b.

The guide member 52 guides the movement in the axial direction X of the vertical sub-moving mechanism 36B. The guide member 52 is attached to a guide shaft 52a provided across the upper portion and the lower portion on both sides in the width direction of the support frame 53, and to the support frame 47 of the upper and lower sub-moving mechanisms 36B, and the guide shaft 52a is slidable. It has a guide cylinder 52b inserted into.

Therefore, when the screw shafts 51a and 51b are rotationally driven by the drive motors 51c, the upper and lower sub-moving mechanisms 36B are guided by the guide members 52 and move in the axial direction X (vertical direction). Also, the upper sub-moving mechanism 36B and the lower sub-moving mechanism 36B move in opposite directions. The angle adjusting mechanism 35 and the sensor head 31 are also moved by the movement of the sub-moving mechanism 36B.

The upper sensor head 31 is moved in the axial direction X by an axial movement mechanism 37 between a measurement position approaching the upper buttress surface B of the tire 1 and an upper retracted position. The lower sensor head 31 is moved in the axial direction X by an axial movement mechanism 37 between a measurement position approaching the lower buttress surface B of the tire 1 and a lower retracted position.

5 and 6 are schematic front views explaining the operation of the mobile device.
Before starting detection of the metal wire, the sensor head 31 of the detection device 12 is arranged at a position separated from the tire 1 in the axial direction X and the radial direction Y, as shown in FIG. 5(a). Then, when the tire 1 set on the rotating device 11 rotates, the detection operation of the metal wire is started.

First, the sensor head 31 is largely moved in the radial direction Y by the main moving mechanism 36A of the radial moving mechanism 36, as indicated by the arrow a in FIG. 5(a). After that, the sensor head 31 is moved in the axial direction X by the axial movement mechanism 37, as indicated by the arrow b in FIG. 5(b). The sensor head 31 moves slightly in the radial direction Y by means of the sub-moving mechanism 36B as shown by arrow c in FIG. to adjust the angle.

By the above operation, the sensor head 31 is arranged at the measurement position along the buttress surface B of the tire 1 . When the metal wire detection operation is completed, the angle adjusting mechanism 35, the axial moving mechanism 37, and the radial moving mechanism 36 perform the reverse operations, so that the sensor head 31 is moved to the tire as shown in FIG. 5(a). Retreat away from 1.

(Configuration of information acquisition device 15)
The information acquisition device 15 acquires information on the shape of the tire 1, for example, the cross section of the tire 1, before the metal wire is detected by the detection device 12, for example, until the tire 1 is set on the rotating device 11. Width, tread width, height, outer diameter, rim diameter, rim width, oblateness, etc. are obtained and stored in advance. The information acquisition device 15 is composed of a control unit having a CPU, etc., a computer having a storage unit for storing information, etc., and the control unit performs processing for acquiring information and processing for outputting information. to run.

The information acquisition device 15 can acquire information about the shape of the tire 1 by, for example, manual input or automatic reading. For automatic reading, for example, a method of reading information by capturing an image of a stamp or print provided on the sidewall 3 of the tire 1 and recognizing characters by image processing can be adopted. In this case, the information acquisition device 15 includes an imaging device that captures an image, and the control unit executes image processing. In addition, as automatic reading, a method of reading information from a bar code or the like may be adopted.

(Configuration of control device 14)
The control device 14 is composed of a control unit having a CPU, etc., a computer having a storage unit for storing information, etc., and various functions are exhibited by the control unit executing programs stored in the storage unit. do. For example, the control device 14 has the function of controlling the operation of the mobile device 13 . Specifically, the control device 14 controls the operation of the electric cylinder 42 in the angle adjustment mechanism 35 and the electric cylinder 45 in the radial movement mechanism 36 . The control device 14 also controls the operation of the drive motor 49 b in the radial movement mechanism 36 and the drive motor 51 c in the axial movement mechanism 37 .

The controller 14 controls the operations of the mechanisms 35, 36 and 37 to move the sensor head 31 by a predetermined amount to a measurement position near the surface of the tire 1 (buttress surface B). Therefore, the control device 14 controls the amount of movement of the sensor head 31 by the moving device 13 .

The control device 14 is connected to the information acquisition device 15 and receives information about the shape of the tire 1 from the information acquisition device 15 . The control device 14 controls the mobile device 13 based on information input from the information acquisition device 15 . Specifically, the control device 14 uses information such as the width dimension and the height dimension of the tire 1 to determine the operation amount of each mechanism 35, 36, 37 of the moving device 13, and the movement amount of each mechanism 35, 36, 37 to operate. Therefore, it is possible to move the sensor head 31 according to the shape of the tire 1 set on the rotating device 11 and position the sensor head 31 at an appropriate measurement position.

The control device 14 receives the output of the sensor unit 32 in the detection device 12, that is, detection data regarding the position of the metal wire (the distance from the metal wire to the sensor head 31). Further, data of the rotation angle detected by the rotation detector 27 of the rotation device 11 is input to the control device 14 . Then, the control device 14 stores the detection data of the sensor unit 32 and the angle data of the rotation detector 27 in association with each other. Therefore, when an abnormality is detected in the detection data of the sensor unit 32, it is possible to specify the position of the abnormality in the circumferential direction from the rotation angle of the tire 1. FIG.

The control device 14 can output information in which the detection data of the sensor unit 32 and the angle data of the rotation detector 27 are associated with each other to the output device 16 such as a display. At this time, if there is an abnormality in the detected data, the fact can be output to notify the operator.

FIG. 7 is a flow chart showing the procedure of the processing of the control device 14 as described above.
The control device 14 receives input of information on the shape of the tire 1 from the information acquisition device 15 in step S1. Then, in step S2, the control device 14 controls the moving device 13 based on the information input from the information acquisition device 15 to move the sensor head 31 to the measurement position.

After that, the control device 14 acquires detection data from the sensor unit 32 and acquires rotation angle data of the tire 1 from the rotation detector 27 in step S3. In step S4, the control device 14 associates and stores the detection data and the angle data. Then, the control device 14 outputs information about the detection data and the angle data to the output device 16 in step S5.

By the above processing, it becomes possible to grasp the arrangement and disorder of the belt cords in the tire 1, and to detect an abnormality before shipment of the product. Moreover, since the sensor head 31 of the detection device 12 can be accurately positioned at the measurement position according to the shape of the tire 1, it is possible to accurately detect the metal wire.

[Action and effect of the embodiment]
(1) The metal wire detection system 10 of the above-described embodiment is a metal wire detection system that detects metal belt cords embedded in the tire 1 from outside the tire 1 . The metal wire detection system 10 includes a rotating device 11 for rotating the tire 1, a detecting device 12 having a sensor head 31 arranged at a predetermined measurement position near the surface of the tire 1 rotated by the rotating device 11, and the sensor head 31. and a control device for controlling the operation of the moving device 13 so as to move the sensor head 31 to a measurement position corresponding to the shape of the tire 1 .

Since the control device 14 controls the operation of the moving device 13 so as to move the sensor head 31 to a measurement position according to the shape of the tire 1, it is possible to move the sensor head 31 to an appropriate measurement position.

The moving device 13 also includes a radial moving mechanism 36 for moving the sensor head 31 in the radial direction Y of the tire 1 , an axial moving mechanism 37 for moving the sensor head 31 in the axial direction X of the tire 1 , and an angle adjustment mechanism 35 for adjusting the angle of the sensor head 31 with respect to the surface.
The radial movement mechanism 36 can move the sensor head 31 to an appropriate radial position according to the height dimension of the tire 1 , and the axial movement mechanism 37 can move the sensor head 31 to an appropriate position according to the width dimension of the tire 1 . The sensor head 31 can be moved to the position. The angle of the sensor head 31 can be adjusted according to the surface shape of the tire 1 by the angle adjusting mechanism 35 .

In the above-described embodiment, the moving device 13 includes both the radial moving mechanism 36 and the axial moving mechanism 37, but only one of the radial moving mechanism 36 and the axial moving mechanism 37 is provided. may

(2) In the above-described embodiments, the sensor head 31 is attached to the angle adjustment mechanism 35 . Therefore, the angle of the sensor head 31 can be directly adjusted by the angle adjustment mechanism 35 , and the angle can be adjusted more accurately according to the surface shape of the tire 1 .

(3) In the above-described embodiment, the angle adjustment mechanism 35 is attached to the radial movement mechanism 36 (sub-movement mechanism 36B). Therefore, the radial movement mechanism 36 can position the sensor head 31 and the angle adjustment mechanism 35 at appropriate radial positions with respect to the tire 1 .

Note that the angle adjustment mechanism 35 may be attached to the axial movement mechanism 37 . In this case, the axial movement mechanism 37 can position the sensor head 31 and the angle adjustment mechanism 35 at appropriate axial positions with respect to the tire 1 .

(4) In the above-described embodiment, the radial movement mechanism 36 is composed of the main movement mechanism 36A with a larger maximum movement distance of the sensor head 31 and the sub-movement mechanism 36B with a smaller maximum movement distance of the sensor head 31 . The axial moving mechanism 37 is attached to the main moving mechanism 36A, the sub-moving mechanism 36B is attached to the axial moving mechanism 37, and the angle adjusting mechanism 35 is attached to the sub-moving mechanism 36B. Therefore, the main moving mechanism 36A causes the axial moving mechanism 37, the sub-moving mechanism 36B, the angle adjusting mechanism 35, and the sensor head 31 to move greatly in the radial direction Y, thereby quickly moving the sensor head 31 closer to or closer to the tire 1. The sensor head 31 can be separated from the tire 1 , and the sensor head 31 can be easily positioned at a more appropriate radial position with respect to the tire 1 by moving the sensor head 31 a little in the radial direction Y with the sub-moving mechanism 36B.

(5) In the above-described embodiment, the angle adjustment mechanism 35 includes the two electric cylinders 42 arranged in parallel and the sensor head 31, and is connected to the piston rods 42b of both electric cylinders 42. A mounting member 41 is provided. Therefore, the angle of the sensor head 31 can be adjusted via the mounting member 41 by extending and contracting the two electric cylinders 42 . Even if the radial position or the axial position of the sensor head 31 fluctuates due to the adjustment of the angle of the sensor head 31, the two electric cylinders 42 are extended and contracted so that the sensor head 31 can be moved in the radial direction while maintaining the angle. The position or axial position can be adjusted.

(6) In the above-described embodiment, the metal wire detection system 10 further includes the information acquisition device 15 that acquires information regarding the shape of the tire 1 . The control device 14 controls the operation of the mobile device 13 based on the information input from the information acquisition device 15 . Therefore, it is possible to move the sensor head 31 to an appropriate measurement position according to the shape of the tire 1 .

(7) In the above-described embodiment, the metal wire detection system 10 further includes the rotation detector 27 that detects the rotation angle of the tire 1 . Then, the control device 14 performs a process of associating the detection data of the detection device 12 with the angle data of the rotation detector 27 . Therefore, the state of the belt cord arrangement of the tire 1 can be grasped together with the position in the rotation direction of the tire 1, and if there is an abnormality in the belt cord arrangement or the like, the specific circumferential position can be detected. can be specified.

(8) In the above-described embodiment, a metal wire detection method for detecting belt cords embedded in the tire 1 from the outside of the tire 1 is disclosed. This method includes the steps of acquiring information about the shape of the tire 1, rotating the tire, and moving the sensor head 31 of the detection device 12 to a predetermined measurement position near the surface of the tire 1 according to the acquired tire shape. and detecting the belt cords by the detection device 12 .
By such a method, it is possible to move the sensor head 31 to an appropriate measurement position according to the shape of the tire 1 .

[Modification]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments described above, and can be implemented in various ways.
FIG. 8 is a front view showing a modification of the angle adjusting mechanism.
In the above-described embodiment, the electric cylinders 42 of the angle adjustment mechanism 35 are arranged parallel to each other along the axial direction X and arranged side by side in the radial direction Y. As shown in FIG. However, it is not limited to this, and can be modified as shown in FIG.

In the modification shown in FIG. 8A, two electric cylinders 42 are arranged parallel to each other along the radial direction Y and arranged side by side in the axial direction X. In the modification shown in FIG. Each electric cylinder 42 can adjust the angle of the sensor head 31 according to the surface of the tire 1 by independently expanding and contracting in the radial direction Y.

In the modification shown in FIG. 8B, two electric cylinders 42 are arranged parallel to each other and arranged side by side in a direction inclined with respect to the axial direction X and the radial direction Y. As shown in FIG. Each electric cylinder 42 can adjust the angle of the sensor head 31 according to the surface of the tire 1 by extending and contracting independently.

In the above-described embodiment, electric cylinders are used as the actuators 42, 45 of the angle adjustment mechanism 35 and radial movement mechanism 36 (sub-movement mechanism 36B). good.
The axial movement mechanism 37 and the radial movement mechanism 36 (main movement mechanism 36A) may be provided with an actuator such as an electric cylinder, a chain transport mechanism, or the like instead of the screw feed mechanism.

The rotating device 11 is not limited to a tire testing machine, and any device that rotates a tire that is used in the manufacturing process of a tire after vulcanization molding can be applied. Further, the rotating device 11 may be a device used exclusively for the metal wire detection system.

In the above-described embodiment, the radial movement mechanism 36 is composed of the main movement mechanism 36A and the sub-movement mechanism 36B, but may be composed of only one of them.

Reference Signs List 1: Tire 10: Metal wire detection system 11: Rotating device 12: Detecting device 13: Moving device 14: Control device 15: Information acquisition device 27: Rotation detector 31: Sensor head 35: Angle adjusting mechanism 36: Radial moving mechanism 36A: Main moving mechanism 36B: Sub-moving mechanism 37: Axial moving mechanism 41: Mounting member 41a: Mounting portion 42: Electric cylinder 42b: Piston rod X: Axial direction Y: Radial direction

Claims (9)

A metal wire detection system for detecting a metal wire embedded in a tire from the outside of the tire,
a rotating device for rotating the tire;
a detection device having a sensor head arranged at a predetermined measurement position near the surface of the tire rotated by the rotating device;
a moving device for moving the sensor head;
a control device that controls the operation of the moving device so as to move the sensor head to the measurement position according to the shape of the tire;
the moving device includes at least one of a radial movement mechanism for moving the sensor head in the radial direction of the tire and an axial movement mechanism for moving the sensor head in the axial direction of the tire;
an angle adjustment mechanism that adjusts the angle of the sensor head with respect to the surface of the tire using an actuator ;
A tire metal wire detection system comprising: The tire metal wire detection method system according to claim 1, wherein the actuator is an electric cylinder. The tire metal wire detection system according to claim 1, wherein the sensor head is attached to the angle adjustment mechanism. 4. The tire metal wire detection system according to claim 3 , wherein the angle adjustment mechanism is attached to either the radial movement mechanism or the axial movement mechanism. the radial movement mechanism comprises a main movement mechanism with a larger maximum movement distance of the sensor head and a sub movement mechanism with a smaller maximum movement distance,
the axial movement mechanism is attached to the main movement mechanism;
The sub-movement mechanism is attached to the axial movement mechanism,
The tire metal wire detection system according to claim 4 , wherein the angle adjusting mechanism is attached to the sub-moving mechanism. Claims 1 to 5 , wherein said angle adjusting mechanism comprises two cylinders arranged in parallel to each other, and a mounting member to which said sensor head is mounted and which is connected to piston rods of said both cylinders. The metal wire detection system for a tire according to any one of Claims 1 to 3. Further comprising an information acquisition device for acquiring information about the shape of the tire,
The tire metal wire detection system according to any one of claims 1 to 6 , wherein the control device controls the operation of the moving device based on the information input from the information acquisition device. The metal wire detection system further comprises a rotation detector that detects the rotation angle of the tire,
The tire metal wire detection system according to any one of claims 1 to 7 , wherein the control device performs a process of associating the detection data of the detection device with the angle data of the rotation detector. A metal wire detection method for detecting a metal wire embedded in a tire from the outside of the tire,
obtaining information about the shape of the tire;
rotating the tire;
moving the sensor head of the detection device to a predetermined measurement position near the surface of the tire according to the obtained tire shape, and operating an actuator for adjusting the angle of the sensor head to adjust the angle ;
and detecting a metal wire by the detection device.

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